00246nam a22000977a 4500020001800000082001700018100002000035245004800055260003700103300000800140  a0-471-09041-7  a631.53 WEL/F  aWelsh, James,R.  aFundamentals Of Plant Genetics and Breeding  aNewyorkbJohn Wiley & Sonsc1981  a282